CN106656284B - Two-stream power water injection method, device and base station - Google Patents

Two-stream power water injection method, device and base station Download PDF

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CN106656284B
CN106656284B CN201510711333.XA CN201510711333A CN106656284B CN 106656284 B CN106656284 B CN 106656284B CN 201510711333 A CN201510711333 A CN 201510711333A CN 106656284 B CN106656284 B CN 106656284B
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streams
water injection
power water
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sinr
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CN106656284A (en
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陈国峰
姚春峰
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0426—Power distribution
    • H04B7/0434—Power distribution using multiple eigenmodes
    • H04B7/0443—Power distribution using multiple eigenmodes utilizing "waterfilling" technique
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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Abstract

The invention provides a method, a device and a base station for water injection of two-stream power, wherein the method comprises the following steps of: determining a power water injection coefficient which enables the spectrum efficiency of the two streams to be maximum according to the SINRs of the two streams and a group of power water injection coefficients set for the two streams; and distributing the transmission power for two flows according to the determined power water injection coefficient. According to the method, based on the principle of maximizing the spectral efficiency, traversal search is performed according to a preset group of two-stream power water injection coefficients, and the corresponding power water injection coefficient when the spectral efficiency is maximized is found. Although the invention utilizes part of the reported information, the invention does not depend on the feedback period and the measurement precision, and finally the whole flow is improved to a certain extent relative to the equal distribution of the two-flow power.

Description

Two-stream power water injection method, device and base station
Technical Field
The invention relates to the technical field of an LTE (Long Term Evolution) system, in particular to a two-stream power water injection method, a device and a base station.
Background
The multiple-input multiple-output (MIMO) technique uses multiple (N)T) Transmitting antenna and a plurality of (N)R) The wireless transmission technology of the receiving antenna can effectively improve the capacity and the link transmission performance of a wireless network.
In the LTE system, a base station transmits a signal to a user equipment in a downlink direction, and the user equipment transmits a signal to the base station in an uplink direction. For the LTE system TM8(transmission mode 8), two MIMO techniques, i.e., transmit diversity and beamforming, are used for transmission. Transmit diversity is more robust with respect to beamforming performance, while beamforming can achieve lower error rates with respect to transmit diversity. In practice, when a base station performs beamforming on two downlink transmission signal streams (two streams for short), the power of the two streams is equal. However, when there is a certain correlation between channels, the performance of two streams is different, which results in slow throughput improvement of one stream. Especially when the channel correlation is high, if the dual-stream beamforming is forced to be used again, the overall throughput performance is lost.
The basic principle of the power water injection algorithm provided by the prior art is as follows: performing power water-filling on the multi-streams according to the feedback information. The main problem of the algorithm is that it depends on the feedback period and the UE (User Equipment) measurement accuracy.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a method, an apparatus and a base station for injecting water for power of two streams, which perform water injection for power of two streams without depending on feedback period and accuracy of UE measurement algorithm, so that overall downlink transmission signal flow of the base station is improved to a certain extent.
The invention adopts the technical scheme that the flow executed by the two-flow power water injection method at the base station side comprises the following steps:
determining a power water injection coefficient which maximizes the spectral efficiency of the two streams according to the SINR (Signal to Interference plus Noise Ratio) of the two streams and a set of power water injection coefficients set for the two streams;
and distributing the transmission power for two flows according to the determined power water injection coefficient.
Further, the process of acquiring SINR of two streams includes:
acquiring two streams of Modulation and Coding Scheme (Modulation and Coding Scheme, Modulation and Coding strategy) which are respectively scheduled;
based on a Mapping relationship between SINR and MCS included in an EESM (Exponential Effective SINR Mapping) criterion in an OFDM (Orthogonal Frequency Division Multiplexing) system, SINR corresponding to MCS respectively scheduled by the two streams is found.
Further, obtaining the MCS for two streams to be respectively scheduled includes:
on the basis of a Channel Quality Indicator (CQI) reported by user equipment, determining an MCS scheduled by one signal stream in two streams according to a code rate approaching principle;
and on the basis of the MCS scheduled by the signal flow, determining the MCS scheduled by the other signal flow in the two flows according to the channel condition number between the two flows.
Further, determining a power water filling coefficient that maximizes the spectral efficiency of the two streams according to the SINR of the two streams and a set of power water filling coefficients set for the two streams includes:
a1: setting a group of power water injection coefficients for the two streams, and determining a new SINR group of the two streams under the set group of power water injection coefficients based on SINRs of the two streams;
a2: based on the mapping relation between SINR and MCS contained in EESM criterion in OFDM system, finding out inner ring MCS group corresponding to new SINR group of two streams;
a3: on the basis of the searched inner ring MCS group and the number of the resource blocks currently scheduled in the downlink, acquiring CQI groups respectively corresponding to two streams according to a code rate approaching principle; or, adding an outer ring MCS to the searched inner ring MCS group to obtain a new inner ring MCS group, and then obtaining two streams of CQI groups respectively corresponding to the two streams according to a code rate approaching principle on the basis of the new inner ring MCS group and the number of resource blocks currently scheduled in a downlink;
a4: and determining the spectrum efficiency groups of the two streams based on the CQI groups respectively corresponding to the two streams, and correspondingly adding the spectrum efficiencies in the spectrum efficiency groups of the two streams to obtain a group of comprehensive spectrum efficiencies, wherein the power water injection coefficient corresponding to the maximum value of the spectrum efficiency in the group of comprehensive spectrum efficiencies is the power water injection coefficient which enables the spectrum efficiency of the two streams to be maximum.
Further, the step a1 includes: a set of power water injection coefficients is set as [ A; b is]Wherein A ═ A1,…,An]N is the number of power water injection coefficients set for each signal stream, and B is 1-a, then the dB value of the set of power water injection coefficients is [ a; b]Wherein a ═ a1，…，an]，b＝[b1，…，bn]；
Let SINR of two streams be SINR respectively1And SINR2And substituting the SINRs of the two streams into the following formula to determine a new SINR group of the two streams under the set group of power water injection coefficients:
SINR1＝SINR1+3-ai，SINR2＝SINR2+3-biwhere i is an integer variable from 1 to n.
Further, according to the determined power water injection coefficient, distributing transmission power for two flows, including:
setting two determined flowsPower water injection coefficient of [ Aj；Bj]J is more than or equal to 1 and less than or equal to n, then in two streams, the power allocated to one signal stream is
Figure BDA0000832015800000031
The power allocated for another signal stream is
Figure BDA0000832015800000032
The invention also provides a two-flow power water injection device, which is arranged at the side of the base station, and the device comprises:
the calculation module is used for determining a power water injection coefficient which enables the spectrum efficiency of the two streams to be maximum according to a group of power water injection coefficients set for the two streams and SINRs of the two streams;
and the distribution module is used for distributing the transmission power for two flows according to the determined power water injection coefficient.
Further, the computing module is also used for
Acquiring MCS respectively scheduled by two streams; based on the mapping relation between SINR and MCS contained in EESM criterion in OFDM system, finding out SINR corresponding to MCS respectively scheduled by two streams.
Further, the computing module is configured to:
setting a group of power water injection coefficients for the two streams, and determining a new SINR group of the two streams under the set group of power water injection coefficients based on SINRs of the two streams;
based on the mapping relation between SINR and MCS contained in EESM criterion in OFDM system, finding out inner ring MCS group corresponding to new SINR group of two streams;
on the basis of the searched inner ring MCS group and the number of the resource blocks currently scheduled in the downlink, acquiring CQI groups respectively corresponding to two streams according to a code rate approaching principle; or, adding an outer ring MCS to the searched inner ring MCS group to obtain a new inner ring MCS group, and then obtaining two streams of CQI groups respectively corresponding to the two streams according to a code rate approaching principle on the basis of the new inner ring MCS group and the number of resource blocks currently scheduled in a downlink;
and determining the spectrum efficiency groups of the two streams based on the CQI groups respectively corresponding to the two streams, and correspondingly adding the spectrum efficiencies in the spectrum efficiency groups of the two streams to obtain a group of comprehensive spectrum efficiencies, wherein the power water injection coefficient corresponding to the maximum value of the spectrum efficiency in the group of comprehensive spectrum efficiencies is the power water injection coefficient which enables the spectrum efficiency of the two streams to be maximum.
The invention also provides a base station which comprises the two-flow power water injection device.
By adopting the technical scheme, the invention at least has the following advantages:
according to the two-stream power water injection method, the two-stream power water injection device and the base station, traversal search is performed according to a preset group of two-stream power water injection coefficients according to the principle of maximizing the frequency spectrum efficiency, and the corresponding power water injection coefficient when the frequency spectrum efficiency is maximized is found. Although the invention utilizes part of the reported information, the invention does not depend on the feedback period and the measurement precision, and finally the whole flow is improved to a certain extent relative to the equal distribution of the two-flow power.
Drawings
FIG. 1 is a flow chart of a two-stream power water injection method according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a two-flow power water injection device according to a second embodiment of the present invention.
Detailed Description
To further explain the technical means and effects of the present invention adopted to achieve the intended purpose, the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments.
In a first embodiment of the present invention, a TM8 mode is taken as an example to describe a two-stream power water injection method, as shown in fig. 1, a flow executed at a base station side includes the following specific steps:
step S101, determining a power water injection coefficient which enables the spectrum efficiency of the two streams to be maximum according to SINRs of the two streams and a group of power water injection coefficients set for the two streams;
specifically, the process of acquiring SINR of two streams includes:
c1: acquiring MCS respectively scheduled by two streams in a TM8 mode;
further, step C1 includes:
on the basis of CQI reported by user equipment, determining MCS scheduled by one signal stream in two streams according to a code rate approaching principle;
and on the basis of the MCS scheduled by the signal flow, determining the MCS scheduled by the other signal flow in the two flows according to the channel condition number between the two flows. The channel condition number between two streams, i.e. the correlation value between two streams determined by the uplink channel estimation value, is well known in the art and will not be described in detail herein.
C2: based on the mapping relation between SINR and MCS contained in EESM criterion in OFDM system, finding out SINR corresponding to MCS respectively scheduled by two streams.
In step S101, determining a power water filling coefficient that maximizes spectral efficiency of two streams based on SINRs of the two streams and a set of power water filling coefficients set for the two streams includes:
d1: setting a group of power water injection coefficients for the two streams, and determining a new SINR group of the two streams under the set group of power water injection coefficients based on SINRs of the two streams; wherein, the number of the set power water injection coefficients in the power water injection system set is an integer greater than 1, that is, n in the following, and the size of the specific number is limited by the computing capability of the device.
Further, the step D1 includes: a set of power water injection coefficients is set as [ A; b is]Wherein A ═ A1,…,An]N is the number of power water injection coefficients set for each signal stream, and B is 1-a, then the dB value of the set of power water injection coefficients is [ a; b]Wherein a ═ a1，…，an]，b＝[b1，…，bn]；
Let SINR of two streams be SINR respectively1And SINR2And substituting the SINRs of the two streams into the following formula to determine a new SINR group of the two streams under the set group of power water injection coefficients:
SINR1＝SINR1+3-ai，SINR2＝SINR2+3-biwhere i is an integer variable from 1 to n.
D2: based on the mapping relation between SINR and MCS contained in EESM criterion in OFDM system, finding out inner ring MCS group corresponding to new SINR group of two streams;
d3: on the basis of the searched inner ring MCS group and the number of the resource blocks currently scheduled in the downlink, acquiring CQI groups respectively corresponding to two streams according to a code rate approaching principle; or, adding an outer ring MCS to the searched inner ring MCS group to obtain a new inner ring MCS group, and then obtaining two streams of CQI groups respectively corresponding to the two streams according to a code rate approaching principle on the basis of the new inner ring MCS group and the number of resource blocks currently scheduled in a downlink; further, the outer-loop MCS corresponding to each signal stream in the two streams is known in the base station, and when the outer-loop MCS is added to the found inner-loop MCS set, the outer-loop MCS corresponding to each signal stream is used for addition.
Further, in step D3, since the code rate can be calculated according to the inner ring MCS and the number of downlink scheduled resource blocks, and the CQI corresponding to the code rate is obtained by using the code rate approaching principle and looking up the table 7.2.3-1 in the 3GPP TS 36.213 protocol, the CQI group corresponding to two streams can be obtained according to the current inner ring MCS group corresponding to two streams and the number of current downlink scheduled resource blocks.
D4: and determining the spectrum efficiency groups of the two streams based on the CQI groups respectively corresponding to the two streams, and correspondingly adding the spectrum efficiencies in the spectrum efficiency groups of the two streams to obtain a group of comprehensive spectrum efficiencies, wherein the power water injection coefficient corresponding to the maximum value of the spectrum efficiency in the group of comprehensive spectrum efficiencies is the power water injection coefficient which enables the spectrum efficiency of the two streams to be maximum.
And S102, distributing the transmission power for two flows according to the determined power water injection coefficient.
Specifically, step S102 includes:
setting the determined power water injection coefficient of the two flows as [ A ]j；Bj]J is more than or equal to 1 and less than or equal to n, then in two streams, the power allocated to one signal stream is
Figure BDA0000832015800000061
The power allocated for another signal stream is
Figure BDA0000832015800000062
A second embodiment of the present invention, which is corresponding to the first embodiment, introduces a two-flow power water injection device in TM8 mode, which is disposed at the base station side, as shown in fig. 2, the device includes the following components:
1) a calculating module 201, configured to determine a power water injection coefficient that maximizes the spectral efficiency of the two streams according to a set of power water injection coefficients set for the two streams and SINR of the two streams;
specifically, the calculating module 201 is further configured to:
acquiring MCS respectively scheduled by two streams in a TM8 mode; further, on the basis of the CQI reported by the user equipment, an MCS scheduled by one signal stream in the two streams is determined according to a code rate approaching principle; and on the basis of the MCS scheduled by the signal flow, determining the MCS scheduled by the other signal flow in the two flows according to the channel condition number between the two flows. The channel condition number between two streams, i.e. the correlation value between two streams determined by the uplink channel estimation value, is well known in the art and will not be described in detail herein.
Based on the mapping relation between SINR and MCS contained in EESM criterion in OFDM system, finding out SINR corresponding to MCS respectively scheduled by two streams.
Further, the calculating module 201 is configured to:
setting a group of power water injection coefficients for the two streams, and determining a new SINR group of the two streams under the set group of power water injection coefficients based on SINRs of the two streams; the number of the set power water injection coefficients in the power water injection system is an integer larger than 1, and the size of the specific number is limited by the computing capacity of the equipment. A further set of power water injection coefficients is [ a; b is]Wherein A ═ A1,…,An]N is the number of power water injection coefficients set for each signal stream, and B is 1-a, then the dB value of the set of power water injection coefficients is [ a; b]Wherein a ═ a1 … an]，b＝[b1 … bn](ii) a Let SINR of two streams be SINR respectively1And SINR2Substituting SINR of two streams intoThe following equation determines a new set of SINR for the two streams for the set of power water-filling coefficients: SINR1＝SINR1+3-ai，SINR2＝SINR2+3-biWhere i is an integer variable from 1 to n.
Based on the mapping relation between SINR and MCS contained in EESM criterion in OFDM system, finding out inner ring MCS group corresponding to new SINR group of two streams;
on the basis of the searched inner ring MCS group and the number of the resource blocks currently scheduled in the downlink, acquiring CQI groups respectively corresponding to two streams according to a code rate approaching principle; or, adding an outer ring MCS to the searched inner ring MCS group to obtain a new inner ring MCS group, and then obtaining two streams of CQI groups respectively corresponding to the two streams according to a code rate approaching principle on the basis of the new inner ring MCS group and the number of resource blocks currently scheduled in a downlink;
and determining the spectrum efficiency groups of the two streams based on the CQI groups respectively corresponding to the two streams, and correspondingly adding the spectrum efficiencies in the spectrum efficiency groups of the two streams to obtain a group of comprehensive spectrum efficiencies, wherein the power water injection coefficient corresponding to the maximum value of the spectrum efficiency in the group of comprehensive spectrum efficiencies is the power water injection coefficient which enables the spectrum efficiency of the two streams to be maximum.
2) And the distribution module 202 is configured to distribute the transmission power for two streams according to the determined power water injection coefficient.
Specifically, the determined power water injection coefficient of the two flows is set as [ A ]j；Bj]And j is greater than or equal to 1 and less than or equal to n, the allocation module 202 is configured to: in two streams, one signal stream is allocated power of
Figure BDA0000832015800000081
The power allocated for another signal stream is
Figure BDA0000832015800000082
A third embodiment of the present invention, a base station, can be understood as a physical device, and the base station includes a two-stream power water injection device in the TM8 mode described in the second embodiment.
The fourth embodiment of the present invention is based on the above embodiments, and three application examples of the present invention are described in this embodiment.
Application example 1:
the two-stream power water injection flow in the downlink transmission mode TM8 of the LTE system is as follows:
the first step is as follows: obtaining MCS respectively scheduled by TM8 double streams by using CQI reported by user equipment and according to code rate approaching principle and correlation value between two streams obtained by uplink, and recording as MCS1And MCS2；
The code rate approach principle can be operated as follows: looking up a table 7.2.3-1 in a 3GPP TS 36.213 protocol to obtain a code rate corresponding to the reported CQI, which is called a target code rate; calculating two code rates according to the number of current scheduling RBs (Resource blocks) and MCS respectively scheduled by TM8 double streams, and finding out the code rate closest to the target code rate from the two calculated code rates, wherein the MCS corresponding to the code rate closest to the target code rate is the MCS corresponding to the reported CQI;
the second step is that: the mapping relation from SINR to MCS can be obtained according to the EESM criterion in the OFDM system. Based on the mapping relationship, the MCS of two streams can be obtained by reverse checking1And MCS2Respectively corresponding SINR1And SINR2；
The third step: setting a group of power water injection coefficients to be selected as follows: [ A; b is]Wherein vector set a is: a ═ A1,…,An]Vector set B is: b is 1-A; the vector is converted to dB values as: vec ═ a; b]dB, where a ═ a1，…，an]，b＝[b1，…，bn](ii) a Where n is the number of power water filling coefficients set for each signal stream, and the size of n is limited by the computing power of the device.
The fourth step: and determining that the SINRs of the two streams are respectively as follows under the condition that the group of power water injection coefficients to be selected is determined: SINR1＝SINR1+3-ai，SINR2＝SINR2+3-biWherein i is an integer variable from 1 to n;
the fifth step: according to the EESM criterion in the OFDM system, inner loop MCS corresponding to the two streams is obtained and is respectively recorded as: MCS (modulation and coding scheme)1And MCS2. Wherein the content of the first and second substances,
Figure BDA0000832015800000091
each element in the two vectors corresponds to one;
and a sixth step: and obtaining two corresponding CQI (channel quality indicator) flows according to a code rate approaching principle by utilizing the number of the downlink scheduling Resource Blocks (RBs) and the inner ring MCS obtained by the previous step, and respectively recording the CQI as:
Figure BDA0000832015800000092
and
Figure BDA0000832015800000093
in the step, an outer ring MCS value can be added on the basis of the inner ring MCS, and then the CQI values corresponding to the two streams are mapped, so that the condition that the reporting value is not completely relied on is ensured, and the channel change can be tracked more accurately; the specific operation of adding the outer loop MCS value on the basis of the inner loop MCS is to add the outer loop MCS value on the CQI1Is added with the outer loop MCS value of the corresponding stream on the CQI2The outer ring MCS value of the corresponding stream is added to each element in the two streams, and the outer ring MCS values respectively corresponding to the two streams are all a fixed value.
The code rate approaching principle is the reverse process of the code rate approaching principle in the first step, namely the code rate is calculated through MCS and the number of RB to be scheduled; and meanwhile, the table 7.2.3-1 in the 3GPP TS 36.213 protocol is searched, and the code rate corresponding to a CQI value is searched to be close to the code rate, wherein the value is the CQI mapped by the MCS.
The seventh step: looking up the table 7.2.3-1 in 3GPP TS 36.213, two sets of spectral efficiencies are obtained and are recorded as:
Figure BDA0000832015800000094
and
Figure BDA0000832015800000095
eighth step: adding the spectral efficiency obtained in the previous step correspondingly, such as:
Figure BDA0000832015800000096
and so onObtaining: FSE ═ FSE1，…，FSEn]. Searching the maximum value in n spectral efficiencies, and taking the power water filling coefficient corresponding to the maximum value, namely max (FSE) ═ FSEjThen, the power water injection coefficient [ A ] corresponding to j is takenj；Bj]；
The ninth step: allocate the power of the 1 st stream to
Figure BDA0000832015800000101
The 2 nd stream has a power of
Figure BDA0000832015800000102
Application example 2:
setting a group of power water injection coefficient vectors to be selected as follows: a ═ 0.10.20.30.40.50.60.70.80.9 ] and B ═ 0.90.80.70.60.50.40.30.20.1.
These two vector values represent the transmit power per stream. If the power a (1) of the first transmission signal stream is equal to 0.1, the power B (1) of the second transmission signal stream is equal to 0.9, and the two signals correspond to each other one by one, so that the total power is guaranteed to be 1.
Reporting the obtained CQI as a CQI measured under an SFBC (Space Frequency Block Code), converting the CQI into a CQI of a single-stream BF (BeamForming), converting the reported CQI into an SINR under the SFBC, adding a fixed value delta on the basis to obtain a CINR of the single-stream BF, namely:
SINRBF_S＝SINRSFBC+Δ
if the dual stream equal power generation rate is adopted, the CINR of the first stream of the dual stream BF is as follows:
SINRBF_D1＝SINRBF_S-3＝SINRSFBC+Δ-3
the above equation minus 3dB is because one of the two streams has half the power delivered, translating to a dB value of 3 dB.
According to this method, the two sets of vectors are converted into power dB values as follows:
Vec1_Pow＝[10.0000 6.9897 5.2288 3.9794 3.0103 2.2185 1.5490 0.9691 0.4576]
Vec2_Pow＝[0.4576 0.9691 1.5490 2.2185 3.0103 3.9794 5.2288 6.9897 10.0000]
if the first streaming power is 0.1, the second streaming power is 0.9, and the SINR of the two streams of the dual-stream BF is:
SINRBF_D1＝SINRBF_S-Vec1_Pow(1)＝SINRSFBC+Δ-10
SINRBF_D2＝SINRBF_S-Vec2_Pow(1)＝SINRSFBC+Δ-0.4576
and converting according to the SINR values of the two streams respectively obtained to obtain the spectral efficiencies of the two streams, comparing, and selecting a proper transmission power scheme. The code is expressed as follows:
for i＝1:length(A)
SINRBF_D1＝SINRSFBC+Δ-Vec1_Pow(i)；
SINRBF_D2＝SINRSFBC+Δ-Vec2_Pow(i)；
SINRBF_D1mapping to FSED1；
SINRBF_D2Mapping to FSED2；
FSDD(i)＝FSED1+FSED2；
end
Where FSE stands for spectral efficiency. At this time, 10 spectral efficiency values are obtained, and a maximum set of corresponding power allocation ratios is selected for transmission power allocation.
Application example 3:
the above application example 1 is to find the mapped spectrum efficiency according to the reduced inner loop MCS value, and find the optimal power water filling coefficient according to the spectrum efficiency maximization criterion. In order to better match the channel variation, the outer loop MCS value can be added to process, reflecting the real channel situation. The flow is basically the same as example 1, and the code changes are expressed as follows:
for i＝1:length(A)
SINRBF_D1＝SINRSFBC+Δ-Vec1_Pow(i)；
SINRBF_D2＝SINRSFBC+Δ-Vec2_Pow(i)；
SINRBF_D1mapping to MCSinitD1(may be mapped according to the EESM guidelines);
SINRBF_D2mapping to MCSinitD2；
MCSD1＝MCSinitD1+ΔMCSD1；
MCSD2＝MCSinitD2+ΔMCSD2；
MCSD1Mapping to FSED1；
MCSD2Mapping to FSED2；
FSDD(i)＝FSED1+FSED2；
end
Wherein, Δ MCSD1And Δ MCSD2Are the outer loop parameters of the two streams respectively. At this time, the outer loop parameters are added, so that the actual channel can be more accurately reflected.
According to the two-stream power water injection method, the device and the base station, traversal search is performed according to a preset group of two-stream power water injection coefficients according to the spectrum efficiency maximization principle, and the corresponding power water injection coefficient when the spectrum efficiency is maximized is found. Although the invention utilizes part of the reported information, the invention does not depend on the feedback period and the measurement precision, and finally the whole flow is improved to a certain extent relative to the equal distribution of the two-flow power.
While the invention has been described in connection with specific embodiments thereof, it is to be understood that it is intended by the appended drawings and description that the invention may be embodied in other specific forms without departing from the spirit or scope of the invention.

Claims (8)

1. A two-flow power water injection method is characterized by comprising the following steps:
traversing and searching the group of power water injection coefficients according to the signal to interference plus noise ratio SINR of the two streams and a group of power water injection coefficients set for the two streams, and determining the power water injection coefficient which enables the spectrum efficiency of the two streams to be maximum;
a1: setting a group of power water injection coefficients for the two streams, and determining a new SINR group of the two streams under the set group of power water injection coefficients based on SINRs of the two streams;
a2: based on the mapping relation between SINR and MCS contained in EESM criterion in OFDM system, finding out inner ring MCS group corresponding to new SINR group of two streams;
a3: on the basis of the searched inner ring MCS group and the number of the resource blocks currently scheduled in the downlink, acquiring CQI groups respectively corresponding to two streams according to a code rate approaching principle; or, adding an outer ring MCS to the searched inner ring MCS group to obtain a new inner ring MCS group, and then obtaining two streams of CQI groups respectively corresponding to the two streams according to a code rate approaching principle on the basis of the new inner ring MCS group and the number of resource blocks currently scheduled in a downlink;
a4: determining two-stream spectrum efficiency groups based on the two-stream respectively corresponding CQI groups, and correspondingly adding the spectrum efficiencies in the two-stream spectrum efficiency groups to obtain a group of comprehensive spectrum efficiencies, wherein the power water injection coefficient corresponding to the maximum value of the spectrum efficiencies in the group of comprehensive spectrum efficiencies is the power water injection coefficient which enables the spectrum efficiencies of the two streams to be maximum;
and distributing the transmission power for two flows according to the determined power water injection coefficient.
2. The two-stream power water injection method according to claim 1, wherein the obtaining process of SINR of two streams includes:
acquiring modulation and coding strategies MCS respectively scheduled by two streams;
and finding out SINRs corresponding to the MCSs respectively scheduled by the two streams based on the mapping relation between the SINR and the MCS contained in the index effective SINR mapping EESM criterion in the orthogonal frequency division multiplexing OFDM system.
3. The two-stream power water filling method according to claim 2, wherein obtaining the separately scheduled MCSs of the two streams comprises:
on the basis of a channel quality indicator CQI reported by user equipment, determining an MCS scheduled by one signal stream in two streams according to a code rate approaching principle;
and on the basis of the MCS scheduled by the signal flow, determining the MCS scheduled by the other signal flow in the two flows according to the channel condition number between the two flows.
4. The two-flow power water injection method according to claim 1, wherein the step a1 comprises:
a set of power water injection coefficients is set as [ A; b is]Wherein A ═ A1,…,An]N is the number of power water injection coefficients set for each signal stream, and B is 1-a, then the dB value of the set of power water injection coefficients is [ a; b]Wherein a ═ a1，…，an]，b＝[b1，…，bn]；
Let SINR of two streams be SINR respectively1And SINR2And substituting the SINRs of the two streams into the following formula to determine a new SINR group of the two streams under the set group of power water injection coefficients:
SINR1＝SINR1+3-ai，SINR2＝SINR2+3-biwhere i is an integer variable from 1 to n.
5. The two-stream power water injection method according to any one of claims 1 to 4, wherein distributing the transmission power for two streams according to the determined power water injection coefficient comprises:
setting the determined power water injection coefficient of the two flows as [ A ]j；Bj]J is more than or equal to 1 and less than or equal to n, n is the number of power water injection coefficients set for each signal stream, and in the two streams, the power distributed to one signal stream is
Figure FDA0002604191920000021
The power allocated for another signal stream is
Figure FDA0002604191920000022
6. A two-flow power water injection device, characterized by comprising:
the calculation module is used for traversing and searching the group of power water injection coefficients according to a group of power water injection coefficients set for the two streams and SINRs of the two streams, and determining the power water injection coefficient which enables the spectrum efficiency of the two streams to be maximum;
setting a group of power water injection coefficients for the two streams, and determining a new SINR group of the two streams under the set group of power water injection coefficients based on SINRs of the two streams;
based on the mapping relation between SINR and MCS contained in EESM criterion in OFDM system, finding out inner ring MCS group corresponding to new SINR group of two streams;
on the basis of the searched inner ring MCS group and the number of the resource blocks currently scheduled in the downlink, acquiring CQI groups respectively corresponding to two streams according to a code rate approaching principle; or, adding an outer ring MCS to the searched inner ring MCS group to obtain a new inner ring MCS group, and then obtaining two streams of CQI groups respectively corresponding to the two streams according to a code rate approaching principle on the basis of the new inner ring MCS group and the number of resource blocks currently scheduled in a downlink;
determining two-stream spectrum efficiency groups based on the two-stream respectively corresponding CQI groups, and correspondingly adding the spectrum efficiencies in the two-stream spectrum efficiency groups to obtain a group of comprehensive spectrum efficiencies, wherein the power water injection coefficient corresponding to the maximum value of the spectrum efficiencies in the group of comprehensive spectrum efficiencies is the power water injection coefficient which enables the spectrum efficiencies of the two streams to be maximum;
and the distribution module is used for distributing the transmission power for two flows according to the determined power water injection coefficient.
7. The two-stream power water injection apparatus of claim 6, wherein the calculation module is further configured to:
acquiring MCS respectively scheduled by two streams; based on the mapping relation between SINR and MCS contained in EESM criterion in OFDM system, finding out SINR corresponding to MCS respectively scheduled by two streams.
8. A base station comprising the two-stream power water injection apparatus as claimed in any one of claims 6 to 7.
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