CN101640904A - Method and device for distributing bandwidth of uplink sounding reference signal - Google Patents
Method and device for distributing bandwidth of uplink sounding reference signal Download PDFInfo
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Abstract
The invention discloses a method for distributing the bandwidth of an uplink sounding reference signal, which comprises the steps of: determining the bandwidth grade of the current sounding referencesignal (SRS) according to scheduling bandwidth; determining SRS transmission power margin corresponding to the current SRS bandwidth grade; utilizing the SRS transmission power margin to judge whetherthe bandwidth corresponding to the current bandwidth grade is power limited; if so, reducing one bandwidth grade to re-determine the SRS transmission power margin; otherwise, distributing the bandwidth corresponding to the current bandwidth grade for a user terminal. The embodiment of the invention also provides a device for distributing the bandwidth of the uplink sounding reference signal. Theadoption of the method and the device can ensure that the distribution of SRS bandwidth is more reasonable, can improve the accuracy of the sounding of user channels, and further promote the scheduling performance of the whole system.
Description
Technical Field
The present invention relates to the field of mobile communications technologies, and in particular, to a method and an apparatus for allocating uplink sounding reference signal bandwidth.
Background
For the existing LTE system, the most important transmission limitation for uplink SRS (Sounding reference signal) in the current specification is the provision related to allocating transmission bandwidth:
the method comprises the steps that a base station is specified to allocate bandwidth for sending SRS signals for each user, and the bandwidth is divided into multiple grades; specifically, there are four different bandwidth classes under each bandwidth configuration, and the base station allocates each user and notifies the user through RRC signaling.
And the factors currently considered for the allocation of SRS bandwidth include: the first factors of the UE scheduling bandwidth and the terminal power are as follows: wherein,
UE scheduling bandwidth, that is, how large frequency band a certain UE needs to be scheduled in, if only this factor is considered, the optimal SRS bandwidth allocation should be equal to the scheduling bandwidth of the UE, for example, if a certain UE is scheduled in the whole system bandwidth, the SRS needs to be transmitted according to the maximum bandwidth level; an important function of the SRS signal is to support frequency domain scheduling, so if the scheduling bandwidth of a user is W, the SRS transmission bandwidth is ideally equal to W, so that the channel quality in the whole scheduling bandwidth can be measured quickly.
A terminal power limitation factor, if a large SRS bandwidth is allocated to a user with a poor channel environment only according to the scheduling bandwidth, the channel information cannot be accurately measured, and the scheduling performance of the whole system is affected, so that the terminal power limitation factor is also considered when the SRS bandwidth is allocated to the UE; however, at present, there is no good method for determining whether the SRS of a certain bandwidth level transmitted by the terminal is power limited.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method and an apparatus for allocating an uplink sounding reference signal bandwidth, which can make SRS bandwidth allocation more reasonable, improve accuracy of user channel sounding, and further improve scheduling performance of the entire system.
In order to solve the above problems, the technical solutions provided by the embodiments of the present invention are as follows:
a method for allocating uplink sounding reference signal bandwidth, comprising the steps of:
determining the SRS bandwidth grade of the current sounding reference signal according to the scheduling bandwidth;
determining an SRS transmitting power margin corresponding to the current SRS bandwidth grade;
judging whether the bandwidth corresponding to the current bandwidth grade is limited in power or not by utilizing the SRS transmitting power margin; if yes, reducing one bandwidth grade to re-determine the SRS transmission power margin; otherwise, the bandwidth corresponding to the current bandwidth grade is distributed to the user terminal.
An apparatus for allocating an uplink sounding reference signal bandwidth, comprising: the device comprises a first processing unit, a second processing unit and a judgment and distribution unit; wherein,
the first processing unit is configured to: determining the SRS bandwidth grade of the current sounding reference signal according to the scheduling bandwidth;
the second processing unit is configured to: calculating an SRS transmission power margin corresponding to the current SRS bandwidth grade by using the current SRS bandwidth grade determined by the first processing unit;
the judgment and distribution unit is used for: judging whether the bandwidth corresponding to the current bandwidth grade is limited in power or not by utilizing the SRS transmission power margin obtained by the second processing unit; if yes, informing the first processing unit to reduce one bandwidth grade, and instructing the second processing unit to re-determine the SRS transmission power margin by using the new bandwidth grade; otherwise, the bandwidth corresponding to the current bandwidth grade is distributed to the user terminal.
It can be seen that, by using the method and apparatus of the embodiments of the present invention, the SRS signal transmission power margin is determined by using the known parameters, and the power margin is compared with the preset threshold, so as to determine whether the bandwidth corresponding to the current SRS bandwidth class causes power limitation, and allocate the bandwidth corresponding to the current bandwidth class that does not cause power limitation to the user for sending the SRS signal, so that the SRS bandwidth allocation can be more reasonable, and the accuracy of user channel detection can be improved, thereby improving the scheduling performance of the whole system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic flow chart of the method of example 1 of the present invention;
fig. 2 is a schematic structural view of an apparatus according to embodiment 2 of the present invention.
Detailed Description
The basic idea of the embodiment of the invention is to determine the margin of the SRS signal transmitting power by using the known parameters, and compare the power margin with the preset threshold value, so that whether the power limitation is caused by the current SRS bandwidth grade can be determined, thereby ensuring that the SRS bandwidth is more reasonably distributed, improving the accuracy of user channel detection and further improving the scheduling performance of the whole system.
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Embodiment 1 of the present invention provides a method for allocating an uplink sounding reference signal bandwidth, as shown in fig. 1, where the method includes:
step 101: determining the current SRS bandwidth grade according to the scheduling bandwidth;
in an optimal situation, a bandwidth corresponding to a bandwidth class allocated to the SRS should be equal to a scheduling bandwidth of the UE, that is, if a certain UE is scheduled in the whole system bandwidth, the SRS needs to be transmitted according to the maximum class bandwidth; for example: if the scheduling bandwidth is W0, preliminarily determining the bandwidth corresponding to the current SRS bandwidth grade according to the scheduling bandwidth, namely MSRSW0, wherein MSRSIs the bandwidth corresponding to the current SRS bandwidth level, NRB ULFor uplink system bandwidth, obviously MSRSThe system bandwidth is not exceeded; of course, those skilled in the art understand that there may be a plurality of ways to determine the current SRS bandwidth level according to the scheduling bandwidth, which is not described in detail in this embodiment;
specifically, as shown in tables 1 to 4 below; the bandwidth is divided into a plurality of grades, wherein b is 0 and corresponds to the maximum SRS bandwidth grade, and the bandwidth corresponding to the grade can be determined only according to the table shown in the following table as long as the bandwidth grade is determined; n is a radical ofRB ULDifferent grades (the unit is RB number) of the uplink system bandwidth are represented and divided into four grades, and each grade corresponds to an SRS bandwidth table; each bandwidth configuration has four different bandwidth grades, and the base station allocates each user and informs the user through RRC signaling; m isSRS，bThe specific bandwidth value of a certain bandwidth grade under a certain bandwidth configuration is represented, and the unit is the RB number; wherein, each table has 8 different cell-level SRS bandwidth configurations, which can notify users through cell broadcast;
TABLE 1 mSRS，b and Nb values for the uplink bandwidth of <math><mrow>
<mn>6</mn>
<mo>≤</mo>
<msubsup>
<mi>N</mi>
<mi>RB</mi>
<mi>UL</mi>
</msubsup>
<mo>≤</mo>
<mn>40</mn>
</mrow></math>
TABLE 2 mSRS，b and Nb values for the uplink bandwidth of <math><mrow>
<mn>40</mn>
<msubsup>
<mrow>
<mo><</mo>
<mi>N</mi>
</mrow>
<mi>RB</mi>
<mi>UL</mi>
</msubsup>
<mo>≤</mo>
<mn>60</mn>
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TABLE 3 mSRS，b and Nb values for the uplink bandwidth of <math><mrow>
<mn>60</mn>
<msubsup>
<mrow>
<mo><</mo>
<mi>N</mi>
</mrow>
<mi>RB</mi>
<mi>UL</mi>
</msubsup>
<mo>≤</mo>
<mn>80</mn>
</mrow></math>
TABLE 4 mSRS，b and Nb values for the uplink bandwidth of <math><mrow>
<mn>80</mn>
<mo><</mo>
<msubsup>
<mi>N</mi>
<mi>RB</mi>
<mi>UL</mi>
</msubsup>
<mo>≤</mo>
<mn>110</mn>
</mrow></math>
By using the table, the bandwidth level of the current SRS can be preliminarily determined according to the requirement of the scheduling bandwidth of the UE, and other manners in the prior art may be specifically adopted, which is not described herein again.
Step 102: determining an SRS transmitting power margin corresponding to the current SRS bandwidth grade;
specifically, in the present embodiment, the power margin may be determined in two ways:
1) firstly, the power of SRS signals sent by the current user terminal in the subframe is obtained, and the maximum allowable transmitting power P corresponding to the current UE gradeMAXAnd the power P of SRS signal transmitted in the subframe iSRS(i) The difference is the SRS transmission power margin PHSRS_M(i) (ii) a Namely, it is
PHSRS_M(i)＝PMAX-PSRS(i) (formula 1)
Wherein, the UE transmits the power P of the SRS signal in the subframe iSRSCalculated by the following formula:
PSRS(i)＝min{PMAX，PSRS_OFFSET+10log10(MSRS)+PO_PUSCH(j) + α.PL + f (i) } (equation 2)
Wherein, PMAXIs the maximum allowed transmit power determined by the UE class; pSRS_OFFSETIs a UE-specific parameter of 4bits configured by a high layer in a semi-static way, and Ks is a parameter configured by the high layer:
when K isSWhen 1.25, PSRS_OFFSETHas a dynamic range of [ -3, 12 [)]The granularity is 1 dB;
when K isSWhen equal to 0, PSRS_OFFSETHas a dynamic range of [ -10.5, 12 [ -10]dB, granularity is 1.5 dB; and MSRSIs the bandwidth corresponding to the current SRS bandwidth level in subframe i, in units of RB numbers, i.e., m in tables 1-4SRS，bA value; f (i) UE-specific correction values, also called TPC commands, which containIn a PDDCH (Physical Uplink Shared Channel) with DCI format 0, or included in the PDCCH of DCI format 3/3a and jointly coded with other TPC commands; pO_PUSCH(j) Is a PUSCH received power target value which is normalized by a cell-specific normalization part P of 8 bitsO_NOMINAL_PUSCH(j) And 4bit UE specific part PO_UE_PUSCH(j) The sum of the components; wherein, PO_NOMINAL_PUSCH(j) Informed by the higher layer (j ═ 0 and 1), and its dynamic range is [ -126, 24]dBm, the granularity is 1 dB; pO_UE_PUSCH(j) Configured by RRC (radio link control), with dynamic range of [ -8, 7 [ -0 and 1 [ ]]dB, granularity is 1 dB; if the PUSCH transmission/retransmission corresponds to a configured scheduling grant, then j ═ 0; if the PUSCH transmission/retransmission corresponds to one received PDCCH of DCI format 0, which contains a scheduling grant for a new packet transmission, then j ═ 1. Alpha belongs to {0, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1} is a path loss compensation factor which is a cell specific parameter and is indicated by a high layer signaling through 3 bits; PL is the downlink path loss measured by the UE;
therefore, only the maximum allowable transmission power P corresponding to the current UE grade is determinedMAXAnd according to the obtained power P of the SRS signal transmitted in the subframe iSRS(i) Determining the SRS transmitting power margin corresponding to the current SRS bandwidth grade according to the difference between the two;
2) and the transmission power difference between the SRS and the PUSCH in the subframe i can be expressed as:
Delta_SRS_PUSCH(i)＝PSRS(i)-PPUSCH(i)＝PSRS_OFFSET+10log10(MSRS)-10log10(MPUSCH(i))-ΔTF(i)
therefore, when the above method cannot be implemented or is difficult to implement, the transmission bandwidth in the subframe i is MSRSThe power margin of the SRS signal of (1) can be expressed as:
PHSRS_M(i)＝PMAX-PSRS(i)
＝PMAX-(Delta_SRS_PUSCH(i)+PPUSCH(i))
＝PH(i)-(PSRS_OFFSET+10log10(MSRS)-10log10(MPUSCH(i))-ΔTF(i) equation 3
(1) Wherein P isPUSCHFor the UE to send PUSCH power in subframe i, it may be set by the following formula according to the current specification:
PPUSCH(i)＝min{PMAX，10log10(MPUSCH(i))+PO_PUSCH(j)α·PL+ΔTF(i) + f (i) } (equation 4)
Wherein, PMAXIs the maximum allowed transmit power determined by the UE class; mPUSCH(i) Is the size of the resource allocated for PUSCH in effect in the ith subframe, expressed in number of Resource Blocks (RBs); pO_PUSCH(j) Has the same meaning as in formula 2; alpha belongs to {0, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1} is a path loss compensation factor which is a cell specific parameter and is indicated by a high layer signaling through 3 bits; PL is the downlink path loss measured by the UE; ksHas the same meaning as in equation 2:
when K isSWhen the content is equal to 1.25, <math><mrow>
<msub>
<mi>Δ</mi>
<mi>TF</mi>
</msub>
<mrow>
<mo>(</mo>
<mi>i</mi>
<mo>)</mo>
</mrow>
<mo>=</mo>
<mn>10</mn>
<msub>
<mi>log</mi>
<mn>10</mn>
</msub>
<mrow>
<mo>(</mo>
<msup>
<mn>2</mn>
<mrow>
<mi>MPR</mi>
<mrow>
<mo>(</mo>
<mi>i</mi>
<mo>)</mo>
</mrow>
<msub>
<mrow>
<mo>·</mo>
<mi>K</mi>
</mrow>
<mi>S</mi>
</msub>
</mrow>
</msup>
<mo>-</mo>
<mn>1</mn>
<mo>)</mo>
</mrow>
<mo>;</mo>
</mrow></math>
when K isSWhen equal to 0, ΔTF(i)＝0；
The meaning of f (i) is the same as in equation 2.
(2) And PH (i) is a power margin when the terminal sends the PUSCH in the subframe i, and can be calculated by the following formula according to the current specification:
PH(i)＝PMAX-{10log10(MPUSCH(i))+PO_PUSCH(j)+α·PL+ΔTF(i) + f (i) } (equation 5)
Wherein P isMAX，MPUSCH(i)，PO_PUSCH(j)，α，PL，ΔTF(i) And f (i) has the same meaning as in equation 4; and the power margin is quantized at [40, -23 ]]Within the range of dB, 1dB is taken as granularity, and the granularity is reported to a high layer by a terminal physical layer and finally sent to a base station.
Therefore, as long as SRS bandwidth M is knownSRSAnd according to the power margin PH (i) when the PUSCH is sent in the subframe i reported by the UE and the known PUSCH resource allocation size M of the base stationPUSCH(i) And transport format ΔTF(i) That is, the available SRS transmission bandwidth is MSRSPower margin P of timeHSRS_M(i)。
Step 103: judging whether the bandwidth corresponding to the current bandwidth grade is limited in power or not by utilizing the SRS transmitting power margin; if yes, returning to reduce one bandwidth grade to re-determine the SRS transmitting power margin; otherwise, the bandwidth corresponding to the current bandwidth grade is distributed to the user terminal.
Specifically, the SRS transmission power margin PH is calculatedSRS_M(i) Then, the base station can judge the bandwidth M used by the UE at the moment according to the mode of setting the limited thresholdSRSWhether transmitting the SRS signal results in power limitation is, of course, understood by those skilled in the art that this is only a preferred way and not a limitation; the method comprises the following steps:
presetting a threshold Beta, if SRS transmitting power margin PHSRS_M(i) Beta is not more than the preset value, the UE is determined to possibly have power limitation at the moment, and the bandwidth M corresponding to the current bandwidth grade is usedSRSWhen the SRS signal is sent, the power limitation risk exists, at this time, the current bandwidth grade is reduced by one grade, and the SRS transmission power margin is recalculated and determined until the SRS transmission power margin is larger than the threshold Beta; and when the SRS transmission power margin is larger than the threshold Beta, the tableObviously using the bandwidth M corresponding to the current bandwidth gradeSRSThe risk of power limitation does not exist when the SRS signal is sent, so that the bandwidth corresponding to the current bandwidth grade is allocated to the user for the user to send the SRS signal;
it should be noted that the preset threshold Beta may be determined according to simulation research and actual system operation data, which is not described herein again.
It can be seen that, by using the method of the embodiment of the present invention, the SRS signal transmission power margin is determined by using the known parameters, and the power margin is compared with the preset threshold, so that it can be determined whether the bandwidth corresponding to the current SRS bandwidth class causes power limitation, and the bandwidth corresponding to the current bandwidth class that does not cause power limitation is allocated to the user for sending the SRS signal, so that the SRS bandwidth allocation can be more reasonable, the accuracy of user channel detection can be improved, and the scheduling performance of the whole system can be improved.
Based on the above idea, embodiment 2 of the present invention further provides an apparatus for allocating an uplink sounding reference signal bandwidth, as shown in fig. 2, including: a first processing unit 201, a second processing unit 202, and a judgment assignment unit 203; wherein,
the first processing unit 201 is configured to: determining the SRS bandwidth grade of the current sounding reference signal according to the scheduling bandwidth;
the second processing unit 202 is configured to: calculating an SRS transmission power margin corresponding to the current SRS bandwidth class by using the current SRS bandwidth class determined by the first processing unit 201;
the judgment allocation unit 203 is configured to: judging whether the bandwidth corresponding to the current bandwidth grade is power-limited or not by using the SRS transmission power margin calculated by the second processing unit 202; if yes, the first processing unit 201 is informed of a bandwidth grade reduction, and the second processing unit 202 is instructed to re-determine the SRS transmission power margin by using the new bandwidth grade; otherwise, the bandwidth corresponding to the current bandwidth grade is distributed to the user terminal.
Preferably, the second processing unit includes: an acquisition unit and a subtractor; wherein,
the acquisition unit is configured to: acquiring the power of sending SRS signals by a current user terminal in a subframe;
the subtractor is configured to: and subtracting the maximum allowed transmitting power corresponding to the current user terminal and the power of the SRS signal transmitted in the subframe acquired by the acquiring unit, determining the obtained difference as the SRS transmitting power margin, and informing the judging and distributing unit.
Preferably, the second processing unit is further configured to: calculating the power margin by using the following formula:
PHSRS_M(i)＝PH(i)-(PSRS_OFFSET+10log10(MSRS)-10log10(MPUSCH(i))-ΔTF(i))
PH (i) is a power margin when the user terminal sends PUSCH in a subframe i; pSRS_OFFSETIs a special parameter of a 4bits user terminal of high-level semi-static configuration; mSRSIs the bandwidth corresponding to the current SRS bandwidth level in the subframe i; mPUSCH(i) Is the size of the resource allocated for the PUSCH in effect at the ith subframe; deltaTF(i) Is the transmission format of the PUSCH in the subframe i.
Preferably, the judgment and assignment unit includes: a judging unit and a distributing unit; wherein,
the judgment unit is used for: judging whether the bandwidth corresponding to the current bandwidth grade is limited in power or not by utilizing the SRS transmission power margin obtained by the second processing unit; if yes, informing the first processing unit to reduce one bandwidth grade, and instructing the second processing unit to re-determine the SRS transmission power margin by using the new bandwidth grade; otherwise, notifying the allocation unit;
the allocation unit is configured to: and allocating the bandwidth corresponding to the current bandwidth grade to the user according to the notification of the judging unit for the user to transmit the SRS signal.
Preferably, the judging unit includes: a presetting unit and a comparing unit; wherein,
the preset unit is used for: presetting a limited threshold value;
the comparison unit is used for: comparing the power margin determined by the second processing unit with a threshold value preset by the preset unit, and when the power margin is not greater than the threshold value, indicating that the bandwidth power corresponding to the current bandwidth grade is limited; otherwise, no restriction is indicated.
In addition, those skilled in the art will readily understand that the apparatus described in the above embodiments may be a base station; meanwhile, from the idea of the embodiment of the present invention, a system including the apparatus disclosed in the above embodiment can be obtained, that is, any system including the apparatus capable of implementing the above embodiment of the present invention should also be included in the protection scope of the present invention.
Those of skill in the art would understand that information, messages, and signals may be represented using any of a variety of different technologies and techniques. For example, the messages and information mentioned in the above description can be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or any combination thereof.
Those of skill would further appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
The above-described embodiments of the present invention do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (12)
1. A method for allocating uplink sounding reference signal bandwidth, comprising:
determining the SRS bandwidth grade of the current sounding reference signal according to the scheduling bandwidth;
determining an SRS transmitting power margin corresponding to the current SRS bandwidth grade;
judging whether the bandwidth corresponding to the current bandwidth grade is limited in power or not by utilizing the SRS transmitting power margin; if yes, reducing one bandwidth grade to re-determine the SRS transmission power margin; otherwise, the bandwidth corresponding to the current bandwidth grade is distributed to the user terminal.
2. The method of claim 1, wherein:
and the bandwidth corresponding to the SRS bandwidth grade is the scheduling bandwidth of the user terminal.
3. The method of claim 1, wherein the determining the SRS transmission power margin corresponding to the current SRS bandwidth class is performed by:
acquiring the power of sending SRS signals by a current user terminal in a subframe;
and carrying out subtraction operation on the maximum allowed transmitting power corresponding to the current user terminal and the power of the SRS transmitted in the acquired subframe, and determining the obtained difference as the SRS transmitting power margin.
4. The method of claim 3, wherein:
the obtained power P of SRS signal transmitted by the current user terminal in the subframeSRS(i) The user terminal calculates and reports by using the following formula:
PSRS(i)＝min{PMAX，PSRS_OFFSET+10log10(MSRS)+PO_PUSCH(j)+α·PL+f(i)}
wherein, PMAXIs the maximum allowed transmitting power corresponding to the user terminal; pSRS_OFFSETIs a special parameter of a user terminal of high-level semi-static configuration; mSRSIs the bandwidth corresponding to the current SRS bandwidth level in the subframe i; f (i) is a UE-specific correction value; pO_PUSCH(j) Is the target value of the received power of the physical uplink shared channel; α is a path loss compensation factor; PL is the downlink path loss measured by the user terminal.
5. The method of claim 1, wherein:
the power margin is calculated by the following formula:
PHSRS_M(i)＝PH(i)-(PSRS_OFFSET+10log10(MSRS)-10log10(MPUSCH(i))-ΔTF(i))
PH (i) is a power margin when the user terminal sends PUSCH in a subframe i; pSRS_OFFSETIs a special parameter of a user terminal of high-level semi-static configuration; mSRSIs the bandwidth corresponding to the current SRS bandwidth level in the subframe i; mPUSCH(i) Is the size of the resource allocated for the PUSCH in effect at the ith subframe; deltaTF(i) Is the transmission format of the PUSCH in the subframe i.
6. The method of any of claims 1 to 5, wherein the determining whether the current bandwidth level is power limited is performed by:
presetting a limited threshold value;
comparing the power margin value with the threshold value, and when the power margin value is not greater than the threshold value, indicating that the bandwidth power corresponding to the current bandwidth grade is limited; otherwise, no restriction is indicated.
7. The method of claim 6, wherein:
the limited threshold value can be set according to simulation research and actual system operation data.
8. An apparatus for allocating an uplink sounding reference signal bandwidth, comprising: the device comprises a first processing unit, a second processing unit and a judgment and distribution unit; wherein,
the first processing unit is configured to: determining the SRS bandwidth grade of the current sounding reference signal according to the scheduling bandwidth;
the second processing unit is configured to: calculating an SRS transmission power margin corresponding to the current SRS bandwidth grade by using the current SRS bandwidth grade determined by the first processing unit;
the judgment and distribution unit is used for: judging whether the bandwidth corresponding to the current bandwidth grade is limited in power or not by utilizing the SRS transmission power margin obtained by the second processing unit; if yes, informing the first processing unit to reduce one bandwidth grade, and instructing the second processing unit to re-determine the SRS transmission power margin by using the new bandwidth grade; otherwise, the bandwidth corresponding to the current bandwidth grade is distributed to the user terminal.
9. The apparatus of claim 8, wherein the second processing unit comprises: an acquisition unit and a subtractor; wherein,
the acquisition unit is configured to: acquiring the power of sending SRS signals by a current user terminal in a subframe;
the subtractor is configured to: and subtracting the maximum allowed transmitting power corresponding to the current user terminal and the power of the SRS signal transmitted in the subframe acquired by the acquiring unit, determining the obtained difference as the SRS transmitting power margin, and informing the judging and distributing unit.
10. The apparatus of claim 8, wherein:
the second processing unit is further to: calculating the power margin by using the following formula:
PHSRS_M(i)＝PH(i)-(PSRS_OFFSET+10log10(MSRS)-10log10(MPUSCH(i))-ΔTF(i))
PH (i) is a power margin when the user terminal sends PUSCH in a subframe i; pSRS_OFFSETIs a special parameter of a user terminal of high-level semi-static configuration; mSRSIs the bandwidth corresponding to the current SRS bandwidth level in the subframe i; mPUSCH(i) Is the size of the resource allocated for the PUSCH in effect at the ith subframe; deltaTF(i) Is the transmission format of the PUSCH in the subframe i.
11. The apparatus according to any one of claims 8 to 10, wherein the judgment allocation unit comprises: a judging unit and a distributing unit; wherein,
the judgment unit is used for: judging whether the bandwidth corresponding to the current bandwidth grade is limited in power or not by utilizing the SRS transmission power margin obtained by the second processing unit; if yes, informing the first processing unit to reduce one bandwidth grade, and instructing the second processing unit to re-determine the SRS transmission power margin by using the new bandwidth grade; otherwise, notifying the allocation unit;
the allocation unit is configured to: and allocating the bandwidth corresponding to the current bandwidth grade to the user terminal according to the notification of the judging unit.
12. The apparatus according to claim 11, wherein the judging unit includes: a presetting unit and a comparing unit; wherein,
the preset unit is used for: presetting a limited threshold value;
the comparison unit is used for: comparing the power margin determined by the second processing unit with a threshold value preset by the preset unit, and when the power margin is not greater than the threshold value, indicating that the bandwidth power corresponding to the current bandwidth grade is limited; otherwise, no restriction is indicated.
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